Delano, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14 °C (high). Annual precipitation averages 1400.8 Millimeters. Delano is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 0.2 °C | 99.82 mm |
| February | -7.7 °C | 1.7 °C | 78.49 mm |
| March | -3.7 °C | 6.5 °C | 104.65 mm |
| April | 2.4 °C | 13.9 °C | 115.06 mm |
| May | 8.3 °C | 19.8 °C | 122.68 mm |
| June | 13.3 °C | 24.1 °C | 140.72 mm |
| July | 15.9 °C | 26.7 °C | 131.32 mm |
| August | 14.9 °C | 25.7 °C | 122.17 mm |
| September | 11.1 °C | 22.1 °C | 138.94 mm |
| October | 5.1 °C | 15.7 °C | 133.1 mm |
| November | -0.4 °C | 8.7 °C | 102.87 mm |
| December | -5.2 °C | 2.9 °C | 111 mm |
| Annual | 3.8 °C | 14 °C | 1400.82 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |